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What is the binary equivalent of decimal number 9?

medium📝 Analysis Q5 of Q15
Intro to Computing - How Data is Represented
What is the binary equivalent of decimal number 9?
A1100
B1010
C1001
D1110
Step-by-Step Solution
Solution:

  1. Step 1: Convert decimal 9 to binary

    9 = 8 + 1 = 2^3 + 2^0, so binary is 1001.

  2. Step 2: Match with options

    1001 is 1001 which matches the binary for 9.

  3. Final Answer:

    1001 -> Option C

  4. Quick Check:

    Decimal 9 = Binary 1001 [OK]
Quick Trick: Decimal 9 = 8 + 1 = 1001 binary [OK]
Common Mistakes:
MISTAKES
  • Mixing up bits order
  • Choosing 1010 which is decimal 10

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